Sexually transmitted infections diagnosed in individuals presenting for forensic and medical care following sexual assault

Background People who report sexual assault express concerns regarding contracting sexually transmitted infection (STI); however, published literature regarding the risk of STI transmission in this context is sparse.Method We audited STI and blood-borne virus (BBV) testing at a forensic and medical sexual assault care service in the Australian Capital Territory between 2004 and 2022. Eligibility for testing among 1928 presentations was defined based on risk (eg, reported penetration). Testing at presentation included chlamydia and gonorrhoea 1850, syphilis and BBV 1472, and after 2-6 weeks, 890 out of 1928 (46.2%) and after 3 months 881 out of 1928 (45.7%), respectively.Results At presentation, 100 out of 1928 (5.2%) individuals were diagnosed with chlamydia, of those, 95 out of 1799 (5.3%) were female, and 5 out of 121 (4.1%) were male. Gonorrhoea was diagnosed in 7 out of 1920 (0.4%), 5 out of 95 female and 2 out of 5 male. Hepatitis B, which was all pre-existing, was diagnosed in 5 out of 1799 (0.3%). Overall, chlamydia prophylaxis was given to 203 out of 1928 (10.5%) and HIV post-exposure prophylaxis to 141 out of 1928 (7.3%). At 2-6 weeks of follow-up, 10 out of 890 (1.1%) individuals were diagnosed with chlamydia, with no gonorrhoea diagnosed. There were no cases of syphilis, hepatitis B or HIV diagnosed at 3-month serology testing in 881 individuals. Chlamydia detection at follow-up was more common in the group aged 15-29 years. Of those provided with chlamydia prophylaxis, 203 out of 1928, only 16 out of 203 (7.9%) were diagnosed with chlamydia.Results At presentation, 100 out of 1928 (5.2%) individuals were diagnosed with chlamydia, of those, 95 out of 1799 (5.3%) were female, and 5 out of 121 (4.1%) were male. Gonorrhoea was diagnosed in 7 out of 1920 (0.4%), 5 out of 95 female and 2 out of 5 male. Hepatitis B, which was all pre-existing, was diagnosed in 5 out of 1799 (0.3%). Overall, chlamydia prophylaxis was given to 203 out of 1928 (10.5%) and HIV post-exposure prophylaxis to 141 out of 1928 (7.3%). At 2-6 weeks of follow-up, 10 out of 890 (1.1%) individuals were diagnosed with chlamydia, with no gonorrhoea diagnosed. There were no cases of syphilis, hepatitis B or HIV diagnosed at 3-month serology testing in 881 individuals. Chlamydia detection at follow-up was more common in the group aged 15-29 years. Of those provided with chlamydia prophylaxis, 203 out of 1928, only 16 out of 203 (7.9%) were diagnosed with chlamydia.Conclusions The offer of STI testing is almost universally accepted by individuals presenting for post-sexual assault care. There were no identifiable factors to justify the routine use of chlamydia prophylaxis. STI testing provided an opportunity for screening and should remain part of the clinical care of people who report sexual assault.